I guess Rover may have some stock or similar to stock brackets, don’t know. Highly doubt any of the inside stuff is the same. I don’t think any of the A/C stuff actually goes in the dash in our cars, I think it’s all under dash bolt up, there are those here who know better than I, and I’ll check an original A/C car my friend has.
Buick Skylark/Special and I guess Pontiac Tempest would likely have parts you could use. Don’t know if interior stuff is the same but probably or very similar. Careful with brackets from the Tempest cause I don’t know if they even came with the V8. Do a posting on the skyLark616263 forum. And post both here and there in the Parts Wanted Classified and keep an eye on Parts for Sale section.
Also, someone who knows need to answer this but i think there’s more than one type of system?